How to use a sauna (and how often)

There is no single correct way to use a sauna, but there is a structure most people converge on, and a few limits worth respecting.

The basic routine

1. Shower first, and dry off. A quick warm shower is hygiene in any shared sauna, and it removes lotions and oils that would otherwise bake onto the benches. Drying properly matters — starting damp delays the point at which you actually begin to sweat.

2. Sit for 10–20 minutes. That is a comfortable round for most people in a traditional sauna. If you are new to it, start at 5–10 minutes and build.

The higher bench is hotter, sometimes dramatically so — see what temperature should a sauna be. Starting on a lower bench is entirely reasonable.

3. Cool down properly. Cool shower, cold plunge, or just fresh air. This is not an interruption to the session; the heat-then-cool cycle is the traditional structure. Give it long enough that you genuinely stop sweating.

4. Repeat, two or three rounds. Then rehydrate.

How often

Two to four sessions a week suits most people, and that is where most of the observational research sits.

Daily use is ordinary in Finland and not inherently a problem for a healthy adult who is hydrating. But there is no evidence that more is proportionally better, and the practical constraint for a home sauna is usually running cost rather than physiology — see sauna running costs.

Cold after heat

Cooling with cold water is the traditional counterpart to the heat, and for many people it is the part that makes the session feel worthwhile.

If you are building a home setup, that pairing is worth planning for deliberately rather than improvising with a garden hose — contrast therapy: sauna and cold plunge covers how people actually run it.

Practical points people learn the hard way

• Hydrate before, not just after. You will lose meaningful fluid; starting dehydrated is what produces the headache.
• No alcohol. It compounds dehydration and impairs the judgement you need to notice you have had enough. This is the single most common factor in sauna incidents.
• Sit on a towel, always. Comfort, hygiene, and it protects the timber.
• Take off metal jewellery. It gets hot enough to burn.
• Don’t sauna on a full stomach, or immediately after heavy training when you are already fluid-depleted.
• Leave phones outside. Heat is bad for batteries, and it rather defeats the point.

When to get out

Immediately, if you feel light-headed, headachy, nauseous, or your heart is racing uncomfortably. Not at the end of the round — now.

That is not a rare edge case, it is the normal signal that you have had enough, and there is nothing to be gained by sitting through it.

Who should check with a doctor first

Sauna use is not universally appropriate. Speak to your GP if you:

• Have a heart condition, or unstable blood pressure
• Are pregnant
• Take medication affecting blood pressure or heat regulation
• Have a condition affecting how you sense temperature

We publish independent guidance on home saunas, not medical advice, and this is genuinely a question for someone who knows your history. On what the evidence does and does not support, see sauna health benefits.

The short version

• Shower first, dry off.
• 10–20 minutes per round; start at 5–10 if new.
• Cool down fully between rounds; two or three rounds is a session.
• 2–4 times a week for most people; daily is fine for many.
• No alcohol, hydrate before and after.
• Light-headed or nauseous? Get out now.

Sources: NHS — Heat exhaustion and heatstroke · Laukkanen et al. 2015, sauna bathing and cardiovascular mortality (JAMA Internal Medicine)